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Chemical Engineering Thermodynamics

Chemical Engineering Thermodynamics
Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is

Negative
Infinity
Positive
Zero

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Chemical Engineering Thermodynamics
In Joule-Thomson porous plug experiment, the

Entire apparatus is exposed to surroundings
Enthalpy does not remain constant
Temperature remains constant
None of these

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Chemical Engineering Thermodynamics
With increase in compression ratio, the efficiency of the otto engine

Remains constant
Decreases
Increases
Increases linearly

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Chemical Engineering Thermodynamics
The fusion of a crystalline solid at its melting point to form a liquid at the same temperature is accompanied by

Decrease of entropy
Decrease in enthalpy corresponding to evolution of heat
No change in enthalpy
Increase in enthalpy corresponding to absorption of heat

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Chemical Engineering Thermodynamics
The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is

Data insufficient, can't be predicted
Less pronounced
Equal
More pronounced

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Chemical Engineering Thermodynamics
At equilibrium condition, the chemical potential of a material in different phases in contact with each other is equal. The chemical potential for a real gas (μ) is given by(where, μ = standard chemical potential at unit fugacity (f° = 1 atm.) and the gas behaves ideally.)

μ° + R/T lnf
μ° + T lnf
μ° + RT ln f
μ°+ R lnf

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